<template>
  <div>
    <!-- 面包屑导航 -->
    <el-breadcrumb>
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>添加商品</el-breadcrumb-item>
    </el-breadcrumb>
    <!-- 卡片视图区域 -->
    <el-card>
      <!-- 提示区域 -->
      <el-alert
        title="添加商品信息"
        type="info"
        show-icon
        center
        :closable="false"
      >
      </el-alert>
      <!-- 步骤条 -->
      <el-steps :active="active - 0" finish-status="success">
        <el-step title="基本信息"></el-step>
        <el-step title="商品参数"></el-step>
        <el-step title="商品属性"></el-step>
        <el-step title="商品图片"></el-step>
        <el-step title="商品内容"></el-step>
        <el-step title="完成"></el-step>
      </el-steps>
      <!-- tab栏区域 -->
      <el-form
        :model="addForm"
        :rules="addFormRules"
        ref="addFormRef"
        label-position="top"
      >
        <el-tabs
          tab-position="left"
          v-model="active"
          :before-leave="beforeTabLeave"
          @tab-click="tabClicked"
        >
          <el-tab-pane label="基本信息" name="0">
            <el-form-item label="商品名称" prop="goods_name">
              <el-input v-model="addForm.goods_name"></el-input>
            </el-form-item>
            <el-form-item label="商品价格" prop="goods_price">
              <el-input v-model="addForm.goods_price" type="number"></el-input>
            </el-form-item>
            <el-form-item label="商品重量" prop="goods_weight">
              <el-input v-model="addForm.goods_weight" type="number"></el-input>
            </el-form-item>
            <el-form-item label="商品数量" prop="goods_number">
              <el-input v-model="addForm.goods_number" type="number"></el-input>
            </el-form-item>
            <el-form-item label="商品分类" prop="goods_cat">
              <!-- 选择商品分类的级联选择框 -->
              <el-cascader
                expandTrigger="hover"
                v-model="addForm.goods_cat"
                :options="cateList"
                :props="cateProps"
                @change="handleChange"
                clearable
              ></el-cascader>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品参数" name="1">
            <el-form-item
              :label="item.attr_name"
              :key="item.attr_id"
              v-for="item in manyTableData"
            >
              <!-- 使用数组渲染复选框组 -->
              <el-checkbox-group v-model="item.attr_vals">
                <el-checkbox
                  border
                  :label="val"
                  v-for="(val, i) in item.attr_vals"
                  :key="i"
                ></el-checkbox>
              </el-checkbox-group>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品属性" name="2">
            <el-form-item
              :label="item.attr_name"
              v-for="item in onlyTableData"
              :key="item.attr_id"
            >
              <el-input v-model="item.attr_vals"></el-input>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品图片" name="3">
            <!-- 商品图片上传
  action:指定图片上传api接口
  :on-preview ： 当点击图片时会触发该事件进行预览操作,处理图片预览
  :on-remove : 当用户点击图片右上角的X号时触发执行
  :on-success：当用户点击上传图片并成功上传时触发
  list-type ：设置预览图片的方式
  :headers ：设置上传图片的请求头 -->
            <el-upload
              :action="uploadURL"
              :on-preview="handlePreview"
              :on-remove="handleRemove"
              :on-success="handleSuccess"
              list-type="picture"
              :headers="headerObj"
            >
              <el-button size="small" type="primary">点击上传</el-button>
            </el-upload>
          </el-tab-pane>
          <el-tab-pane label="商品内容" name="4">
            <!-- 富文本编辑器组件 -->
            <quill-editor v-model="addForm.goods_introduce">            
            </quill-editor>
              <el-button type="primary" class="btnAdd" @click="add">添加商品</el-button>
          </el-tab-pane>
        </el-tabs>
      </el-form>
    </el-card>
    <!-- 预览图片对话框 -->
    <el-dialog title="图片预览" :visible.sync="previewVisible" width="50%">
      <img :src="previewPath" width="100%" />
    </el-dialog>
  </div>
</template>

<script>
import _ from 'lodash'
export default {
  data() {
    return {
      active: "0",
      // 商品添加数据对象
      addForm: {
        goods_name: "",
        goods_price: 0,
        goods_weight: 0,
        goods_number: 0,
        goods_cat: [],
        pics: [],
        //商品的详情介绍
        goods_introduce: "",
        attrs:[]
      },
      addFormRules: {
        goods_name: [
          { required: true, message: "请输入商品名称", trigger: "blur" },
        ],
        goods_price: [
          { required: true, message: "请输入商品价格", trigger: "blur" },
        ],
        goods_weight: [
          { required: true, message: "请输入商品重量", trigger: "blur" },
        ],
        goods_number: [
          { required: true, message: "请输入商品数量", trigger: "blur" },
        ],
        goods_cat: [
          { required: true, message: "请选择商品分类", trigger: "blur" },
        ],
      },
      cateList: [],
      cateProps: {
        value: "cat_id",
        label: "cat_name",
        children: "children",
      },
      //动态参数列表
      manyTableData: [],
      //静态属性列表
      onlyTableData: [],
      //上传图片的url地址
      uploadURL: "http://127.0.0.1:8888/api/private/v1/upload",
      headerObj: { Authorization: window.sessionStorage.getItem("token") },
      //保存预览图片的url地址
      previewPath: "",
      //控制预览图片对话框的显示和隐藏
      previewVisible: false,
    };
  },
  created() {
    this.getCateList();
  },
  methods: {
    async getCateList() {
      const { data: res } = await this.$http.get("categories");

      if (res.meta.status !== 200) {
        return this.$message.error("获取商品分类数据失败");
      }
      this.cateList = res.data;
    },
    handleChange() {
      //如果用户选择的不是三级分类,该次选择无效，因为必须选择三级分类
      if (this.addForm.goods_cat.length !== 3) {
        this.addForm.goods_cat = [];
        return;
      }
    },
    beforeTabLeave(activeName, oldActiveName) {
      //在tab栏切换之前触发，两个形参为切换前，后的tab栏name
      if (oldActiveName === "0") {
        //在第一个标签页的时候
        if (this.addForm.goods_cat.length !== 3) {
          this.$message.error("请选择商品的分类");
          return false;
        }
        else if (this.addForm.goods_name.trim() === "") {
          this.$message.error("请输入商品名称");
          return false;
        } else if (this.addForm.goods_price.trim() === "0") {
          this.$message.error("请输入商品价格");
          return false;
        } else if (this.addForm.goods_weight.trim() === "0") {
          this.$message.error("请输入商品重量");
          return false;
        } else if (this.addForm.goods_number.trim() === "0") {
          this.$message.error("请输入商品数量");
          return false;
        }
      }
    },
    async tabClicked() {
      //当用户点击切换tab栏时触发
      if (this.active === "1") {
        //发送请求获取动态参数
        const { data: res } = await this.$http.get(
          `categories/${this.cateId}/attributes`,
          { params: { sel: "many" } }
        );

        if (res.meta.status !== 200) {
          return this.$message.error("获取动态参数列表失败");
        }
        //将attr_vals字符串转换为数组
        res.data.forEach((item) => {
          item.attr_vals =
            item.attr_vals.length === 0 ? [] : item.attr_vals.split(",");
        });
        console.log(res.data);
        this.manyTableData = res.data;
      } else if (this.active === "2") {
        //发送请求获取静态属性
        const { data: res } = await this.$http.get(
          `categories/${this.cateId}/attributes`,
          { params: { sel: "only" } }
        );

        if (res.meta.status !== 200) {
          return this.$message.error("获取静态属性列表失败");
        }
        console.log(res.data);

        this.onlyTableData = res.data;
      }
    },
    handlePreview(file) {
      //当用户点击图片进行预览时执行，处理图片预览
      //形参file就是用户预览的那个文件
      this.previewPath = file.response.data.url;
      //显示预览图片对话框
      this.previewVisible = true;
    },
    handleRemove(file) {
      //当用户点击X号删除时执行
      //形参file就是用户点击删除的文件
      //获取用户点击删除的那个图片的临时路径
      const filePath = file.response.data.tmp_path;
      //使用findIndex来查找符合条件的索引
      const index = this.addForm.pics.findIndex(
        (item) => item.pic === filePath
      );
      //移除索引对应的图片
      this.addForm.pics.splice(index, 1);
    },
    handleSuccess(response) {
      //当上传成功时触发执行
      //形参response就是上传成功之后服务器返回的结果
      //将服务器返回的临时路径保存到addForm表单的pics数组中
      this.addForm.pics.push({ pic: response.data.tmp_path });
    },
    add(){
  this.$refs.addFormRef.validate(async valid=>{
    if(!valid) return this.$message.error("请填写必要的表单项!")

    //将addForm进行深拷贝，避免goods_cat数组转换字符串之后导致级联选择器报错
    const form = _.cloneDeep(this.addForm)
    //将goods_cat从数组转换为"1,2,3"字符串形式
    form.goods_cat = form.goods_cat.join(",")
    //处理attrs数组，数组中需要包含商品的动态参数和静态属性
    //将manyTableData（动态参数）处理添加到attrs
    this.manyTableData.forEach(item=>{
      form.attrs.push({ attr_id:item.attr_id, attr_value:item.attr_vals.join(",") }) 
    })
    //将onlyTableData（静态属性）处理添加到attrs
    this.onlyTableData.forEach(item=>{
      form.attrs.push({ attr_id:item.attr_id, attr_value:item.attr_vals }) 
    })

    //发送请求完成商品的添加,商品名称必须是唯一的
    const {data:res} = await this.$http.post('goods',form)
    if(res.meta.status !== 201){
      return this.$message.error('添加商品失败')
    }
    this.$message.success('添加商品成功')
    //编程式导航跳转到商品列表
    this.$router.push('/goods')
  })
}
  },
  //添加 计算属性获取三级分类
  computed: {
    cateId() {
      if (this.addForm.goods_cat.length === 3) {
        return this.addForm.goods_cat[2];
      }
      return null;
    },
  },
};
</script>

<style scoped>
.el-checkbox {
  margin: 0 5px 0 0 !important;
}

/* 给添加商品按钮添加间距 */
.btnAdd{
  margin-top:15px;
}
</style>